Free agents Andrew Mitchell, Salim Kerkar, Chris Hegarty - whose contracts expired at the end of the season - also reported for fitness tests and their immediate future remains unclear.

Andrew Little, who is also out of contract, is not among the 12.

The club said Dorin Goian and Alejandro Bedoya were not due back today while Maurice Edu and Carlos Bocanegra were also given extra time off after playing for the United States in World Cup qualifiers.

Ten players - including captain Steven Davis and international stars Allan McGregor, Steven Naismith and Steven Whittaker - have objected to a transfer from soon-to-be-liquidated Rangers to the newco club, with John Fleck and Juan Manuel Ortiz joining those ranks yesterday.

Rhys McCabe, Sone Aluko, Kyle Lafferty and Jamie Ness also objected to the transfer of their contracts.

PFA Scotland believes they are free agents and have asked the football authorities to release their registration from Rangers, but Green has vowed to seek compensation.

Green bought the assets of Rangers for £5.5million two weeks ago but his club's future is unclear, with SPL clubs set to vote against admitting them to the top flight and opposition growing among Scottish Football League clubs over a deal to put them in the First Division.